You need an area rug for the sitting area, and art on the blank walls.

what color? I have been looking for an oversized rug (9x12 or 10x13).

Can you show the rest of the area so we can decide what direction you should go?

Warm lighting... I will take another picture in natural light tomorrow.

With infinite budget I’d replace the floors with wood or wood look tile/lvp. And get table or floor lamps, don’t use overheads unless necessary

consider textile art or a tapestry for one wall. Or wood art, something organic.